STM32F0xx_StdPeriph_Examples/ADC/ADC_LowPower/main.c

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/**
  ******************************************************************************
  * @file    ADC/ADC_LowPower/main.c 
  * @author  MCD Application Team
  * @version V1.4.0
  * @date    24-July-2014
  * @brief   Main program body
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; COPYRIGHT 2014 STMicroelectronics</center></h2>
  *
  * Licensed under MCD-ST Liberty SW License Agreement V2, (the "License");
  * You may not use this file except in compliance with the License.
  * You may obtain a copy of the License at:
  *
  *        http://www.st.com/software_license_agreement_liberty_v2
  *
  * Unless required by applicable law or agreed to in writing, software 
  * distributed under the License is distributed on an "AS IS" BASIS, 
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  *
  ******************************************************************************
  */

/* Includes ------------------------------------------------------------------*/
#include "main.h"

/** @addtogroup STM32F0xx_StdPeriph_Examples
  * @{
  */

/** @addtogroup ADC_LowPower
  * @{
  */

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
#define MESSAGE1   "STM32F0xx CortexM0  " 
#ifdef USE_STM320518_EVAL
  #define MESSAGE2   "   STM320518-EVAL   "
  #define MESSAGE3   "  Turn RV3(PC.01)    "
  #define MESSAGE4   "  Press KEY button  "
#else 
  #define MESSAGE2   "   STM32072B-EVAL   " 
  #define MESSAGE3   "  Turn RV3(PC.00)    "
  #define MESSAGE4   "Press TAMPER button "
#endif /* USE_STM320518_EVAL */


/* Uncomment the line below if you will use the ADC Low Power features */ 
/* #define ADC_LOWPOWER */

/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
__IO uint16_t  ADC1ConvertedValue = 0, ADC1ConvertedVoltage = 0;

/* Private function prototypes -----------------------------------------------*/
static void Display_Init(void);
static void Display(void);
static void ADC_Config(void);
static void TIM_Config(void);

/* Private functions ---------------------------------------------------------*/

/**
  * @brief  Main program.
  * @param  None
  * @retval None
  */
int main(void)
{
  /*!< At this stage the microcontroller clock setting is already configured, 
       this is done through SystemInit() function which is called from startup
       file (startup_stm32f0xx.s) before to branch to application main.
       To reconfigure the default setting of SystemInit() function, refer to
       system_stm32f0xx.c file
     */ 

  /* LCD Display init  */
  Display_Init();
  
  /* Key button and Tamper button configuration */
#ifdef USE_STM320518_EVAL
  STM_EVAL_PBInit(BUTTON_KEY, BUTTON_MODE_GPIO);
#else
  STM_EVAL_PBInit(BUTTON_TAMPER, BUTTON_MODE_GPIO);
#endif /* USE_STM320518_EVAL */  

  /*  Configures LED1 GPIO */
  STM_EVAL_LEDInit(LED1);
  
  /* Configure ADC1  */
  ADC_Config();

  /* Configure TIM3  */
  TIM_Config();  

  /* Infinite loop */
  while (1)
  {
    /* Press Key button for STM320518_EVAL and Tamper button for STM32072B_EVAL  to get the converted data */
#ifdef USE_STM320518_EVAL
    while(STM_EVAL_PBGetState(BUTTON_KEY) != RESET);
#else
    while(STM_EVAL_PBGetState(BUTTON_TAMPER) != RESET);
#endif /* USE_STM320518_EVAL */ 
    
    /* Get ADC1 converted data */
    ADC1ConvertedValue =ADC_GetConversionValue(ADC1);
    
    /* Compute the voltage */
    ADC1ConvertedVoltage = (ADC1ConvertedValue *3300)/0xFFF;
    
    /* Display converted data on the LCD */
    Display();
  }
}

/**
  * @brief  ADC1 configuration
  * @param  None
  * @retval None
  */
static void ADC_Config(void)
{
  ADC_InitTypeDef          ADC_InitStructure;
  GPIO_InitTypeDef         GPIO_InitStructure;
  NVIC_InitTypeDef         NVIC_InitStructure;
  
  /* GPIOC Peripheral clock enable */
  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOC, ENABLE);
  
   /* ADC1 Peripheral clock enable */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
  
  /* Configure ADC Channel11(for STM320518 EVAL) and Chanenl10(for STM32072B EVAL) as analog input */
#ifdef USE_STM320518_EVAL
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1 ;
#else
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 ;
#endif /* USE_STM320518_EVAL */
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ;
  GPIO_Init(GPIOC, &GPIO_InitStructure);
  
  /* ADCs DeInit */  
  ADC_DeInit(ADC1);
  
  /* Configure the ADC1 in continous mode withe a resolution equal to 12 bits*/
  ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
  ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
  ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_Rising;    
  ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T3_TRGO;
  ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
  ADC_InitStructure.ADC_ScanDirection = ADC_ScanDirection_Upward;
  ADC_Init(ADC1, &ADC_InitStructure); 
  
  /* Convert the ADC1 Channel 11 and channel10 with 28.5 Cycles as sampling time */ 
#ifdef USE_STM320518_EVAL
  ADC_ChannelConfig(ADC1, ADC_Channel_11 , ADC_SampleTime_28_5Cycles); 
#else
  ADC_ChannelConfig(ADC1, ADC_Channel_10 , ADC_SampleTime_28_5Cycles); 
#endif /* USE_STM320518_EVAL */  

  /* ADC Calibration */
  ADC_GetCalibrationFactor(ADC1);
  
  /* Enable OVR interupt */
  ADC_ITConfig(ADC1, ADC_IT_OVR, ENABLE);
  
  /* Configure and enable ADC1 interrupt */
  NVIC_InitStructure.NVIC_IRQChannel = ADC1_COMP_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);
  
  /* Enable the ADC peripheral */
  ADC_Cmd(ADC1, ENABLE);     
  
  /* Wait the ADRDY flag */
  while(!ADC_GetFlagStatus(ADC1, ADC_FLAG_ADRDY)); 
  
#if defined (ADC_LOWPOWER)
  /* Enable the wait conversion mode */    
  ADC_WaitModeCmd(ADC1, ENABLE); 
  
  /* Enable the Auto power off mode */
  ADC_AutoPowerOffCmd(ADC1, ENABLE); 
#endif
  
  /* ADC1 regular Software Start Conv */ 
  ADC_StartOfConversion(ADC1);
}

/**
  * @brief  TIM3 configuration
  * @param  None
  * @retval None
  */
static void TIM_Config(void)
{
  TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
  TIM_OCInitTypeDef        TIM_OCInitStructure; 
  
  /* ADC1 Peripheral clock enable */ 
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
  
  TIM_DeInit(TIM3);
  
  TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);
  
  TIM_OCStructInit(&TIM_OCInitStructure);
    
  /* Time base configuration */
  TIM_TimeBaseStructure.TIM_Period = 0xFF;
  TIM_TimeBaseStructure.TIM_Prescaler = 0x0;
  TIM_TimeBaseStructure.TIM_ClockDivision = 0x0;
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  
  TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);
  
  /* TIM3 TRGO selection */
  TIM_SelectOutputTrigger(TIM3, TIM_TRGOSource_Update);
  
  /* TIM3 enable counter */
  TIM_Cmd(TIM3, ENABLE);
}
/**
  * @brief  Display ADC converted value on LCD
  * @param  None
  * @retval None
  */
static void Display(void)
{
  uint32_t v=0,mv=0;
  uint8_t text[50];

  v=(ADC1ConvertedVoltage)/1000;
  mv = (ADC1ConvertedVoltage%1000)/100;
  sprintf((char*)text,"   V(Pot) = %d,%d V   ",v,mv);
  /* Set the LCD Back Color and Text Color*/
  LCD_SetBackColor(White);
  LCD_SetTextColor(Blue);
  
  LCD_DisplayStringLine(LINE(6),text);
}

/**
  * @brief  Display Init (LCD)
  * @param  None
  * @retval None
  */
static void Display_Init(void)
{
  /* Initialize the LCD */
#ifdef USE_STM320518_EVAL
  STM320518_LCD_Init();
#else
  STM32072B_LCD_Init();
#endif /* USE_STM320518_EVAL */

  /* Clear the LCD */ 
  LCD_Clear(White);

  /* Set the LCD Text size */
  LCD_SetFont(&Font8x12);

  /* Set the LCD Back Color and Text Color*/
  LCD_SetBackColor(Blue);
  LCD_SetTextColor(White);

  /* Display */
  LCD_DisplayStringLine(LINE(0x13), "       ADC Low Power Mode example       ");
  /* Set the LCD Text size */
  LCD_SetFont(&Font16x24);

  LCD_DisplayStringLine(LINE(0), MESSAGE1);
  LCD_DisplayStringLine(LINE(1), MESSAGE2);
  
  /* Set the LCD Back Color and Text Color*/
  LCD_SetBackColor(White);
  LCD_SetTextColor(Blue);

  /* Display */
  LCD_DisplayStringLine(LINE(3), MESSAGE3);
  LCD_DisplayStringLine(LINE(4), MESSAGE4);  
}

#ifdef  USE_FULL_ASSERT

/**
  * @brief  Reports the name of the source file and the source line number
  *         where the assert_param error has occurred.
  * @param  file: pointer to the source file name
  * @param  line: assert_param error line source number
  * @retval None
  */
void assert_failed(uint8_t* file, uint32_t line)
{ 
  /* User can add his own implementation to report the file name and line number,
     ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */

  /* Infinite loop */
  while (1)
  {
  }
}
#endif

/**
  * @}
  */

/**
  * @}
  */

/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/